Bis-(2.3-hydroxynaphthoyl)-4.4&#39;-diamino-3.3&#39;-dialkyloxy-diaryls



Patented June 2, 1925.

UNITED STATES 1,540,510 PATENT OFFICE.

ARTHUR ZITSCHER, F OFFENBACH-ON-THE-MAIN, GERMANY, ASSIGNOR TO THE COR- PORATIO'E OF CHEMISCHE FABRIK GRIESHEIM-ELEKTRON, 0F FRANKFORT-ON- THE-MAIN, GERMANY.

BIS-(2.3HYDROXYNAPHTHOYL)-4.4-DIAMINO-3.3 -DIALKYLOXY-DIARYLS.

No Drawing.

To all whom it may concern:

Be it known that I, ARTHUR ZITSCHER, a citizen of Germany, and resident of Offer;- bach-on-the-Main, Germany, have invented new and useful Improvements in. Bis-(2.3- Hydroxynaphthoyl) 4.4 Diamino 3.3-

Application filed November 30, 1923.

Serial No. 677,879.

wherein R and R mean the same or difi'erent monovalent substituents, yielding, when combined with diazocompounds, valuable dyestuffs.

These bodies are obtained by causing 2.3- hydroxynaphthoic acid and a dehydrating agent such as phosphorus trichlorid, thionylchlorid, to react upon the 4r.4-diamino-3.3- dialkyloxy-diaryls, advantageously in a sol vent or diluent.

The following example illustrates the invention, the parts being by weight, and all temperatures being in centigrade degrees.

Ewample.

188 parts of 2.3-hydroxynaphthoic acid are suspended in xylene, a solution of 122 parts of dianisidin in xylene is added while stirring and parts of phosphorus trichlorid are dropped in. The mass is now boiled under the reflux condenser, while continuously stirring, until evolution of hydrogen chloride ceases; then sodium carbonate is added until the reaction is alkaline, and the xylene is expelled by steam. The residue is filtered and well washed. For rectification the product is treated with diluted hydrochloric acid at about 70, filtered and washed, until the reaction is neutral. Then the residue is dissolved in hot diluted canstic soda solution, the solution is filtered and the bis- (2.3-hydroxynaphthoyl) -dianisidin is separated by means of an acid. The product is filtered, Well washed and dried. When crystallized from ortho-nitrotoluene, the bis- (2.3-hydroxynaphthoyl) -dianisidin is obtained in almost colorless little crystals, grown together to twins, melting at 348 (not corrected) under decomposition. It is soluble in diluted caustic soda solution to a brownish yellow solution and is very little soluble in the usual organic solvents.

The bis- (2.3-hydroxynaphthoyl) -diphenetidin prepared in a similar manner, is ob tained from nitrobenzene in almost colorless needles melting at 346-348 (not'corrected). It is soluble in diluted caustic soda solution to a brownish yellow solution and is very little soluble in the usual organic solvents.

In a similar manner also other bis-(2.3- hydroxynaphthoyl) 4.4. diamino 3.3- dialkyloxydiaryls can be prepared.

Now what I claim and desire to secure by Letters Patent is the following.

1. As new articles the bis-(2.3-hydroxynaphthoyl) 44 diamino 3.3-dialkyloxydialryls, having probably the general formu a:

wherein R and R mean the same or difierent monovalent substituents, which are when Alkyl dry almostcolorless crystalline powders, soluble in diluted caustic sodasolution to a brownish yellow solution and very little solnaphthoyl) -dianisidin, having probably the uble in the usual organic solvents. formula:

2. As new article the bis-(2.3-hydroxy- 0 OH HO which is when dry an almost colorless ci'ysas my invention, I have signed my name, talline powder, soluble in diluted caustic this 15th day of November 1923.

soda solution to a brownish yellow solution ARTHUR ZITSCHER and very little soluble in the usual organic Witnesses:

10 solvents. PETER LAUTnNsonLZioEn,

In testimony, that I claim the foregoing FRITZ DESOR. 

